try running in compatability mode, or a downgrade patch, right click properties and compatibility and run in 98, also the patch ( i can't remember where i got it) but it is for dual cores because they a WAY tio strong for tha kind of processing i was playing 2' moons it skipped slow fps, and crashes used the patch and it worked ill see if i can find where i got it but try the compatability mode first man.
2.4 Ghz celeron, 1.25 PNY pc 2700 RAM,PNY VERTIGO 5200 FX , 40 GB HDD
900Mhz 256 RAM , MX 4000, 30 GB HDD
1.9Ghz dual core AMD Athlon 2 GB 384 VRAM 320 Gb HD
2.3 tricore phenom,2 GB RAM , EVGA 9600 GSO,250 GB SSD
2.6 X4 620, 4GB RAM, 9600 GSO, 500 GB HDD/I'm part of The Project